Alert archive / Wisconsin / Tornado Warnings in 2004

Tornado Warning 30, NWS Twin Cities, MN

August 8, 2004Saint Croix County, Wisconsin

NWS Twin Cities, MN issued this tornado warning at Aug 8, 2004, 7:37 PM CDT for Saint Croix County, Wisconsin. It was in force for 38 min. No storm report in the archive falls inside the area while it was in force.

The area

The outline as issued.

The facts

Issued
Aug 8, 2004, 7:37 PM CDT (00:37 UTC)
Expired
Aug 8, 2004, 8:15 PM CDT
In force
38 min
Issued by
NWS Twin Cities, MN
Area
Counties, with a storm outline in the text

County Saint Croix County, WI

The radar

The Minneapolis radar (KMPX), 86 km from the middle of the area, began a volume at 00:38 UTC, the scan nearest the moment this went out.

Open the radar archive at this moment

The archived warnings, watches and discussions in force at that minute are drawn over the scan, this one among them.

The watch it was issued in

The SPC watch in force over the same counties when this warning went out.

IssuedProductOfficeLasted
Aug 8, 5:20 PM CDTSevere Thunderstorm WatchSPC7 hr

The nearest sounding before it

Minneapolis, MN (KMPX), launched 00:00Z, 0.6 hours before the alert went out and 89 km from the middle of its area. This is the routine balloon launch nearest before it, the air the forecaster had in hand, not a measurement taken for the alert.

Skew-T log-pSkew-T log-p diagram, Minneapolis, MN at 00:00Z on 2004-08-09Temperature and dew point through the depth of the atmosphere, with the mixed-layer parcel. CAPE 2371 joules per kilogram.LCLEL10008507005003002001001 km2 km3 km6 km9 km12 km15 km-30°-20°-10°0°10°20°30°40°
Temperature in red, dew point in green, the mixed-layer parcel dashed.
HodographHodograph, Minneapolis, MN at 00:00Z on 2004-08-09The wind through the lowest 10 kilometers. Zero to 1 km storm-relative helicity 48 square meters per square second.193958Sfc1 km3 km6 km9 kmRMLM
The wind turning with height, colored by layer: ground to 1 km, 1 to 3 km, 3 to 6 km, 6 to 10 km.
Mixed-layer CAPE
2371 J/kg
Mixed-layer CIN
-3 J/kg
Mixed-layer LCL
1041 m above ground
0-6 km bulk shear
29 kt
0-1 km storm-relative helicity
48 m²/s²
0-3 km storm-relative helicity
134 m²/s²
Significant tornado parameter
0.5
Supercell composite
3.0

Open this sounding in Storm Lab

The text

As transmitted, in the capitals the NWS used until 2016.

000 
WFUS53 KMPX 090037
TORMPX
WIC109-090115-

BULLETIN - EAS ACTIVATION REQUESTED
TORNADO WARNING
NATIONAL WEATHER SERVICE TWIN CITIES/CHANHASSEN MN
736 PM CDT SUN AUG 8 2004

THE NATIONAL WEATHER SERVICE IN THE TWIN CITIES HAS ISSUED A

* TORNADO WARNING FOR...
  ST. CROIX COUNTY IN WEST CENTRAL WISCONSIN

* UNTIL 815 PM CDT

* AT 733 PM CDT...RADAR INDICATED A SEVERE THUNDERSTORM CAPABLE OF   
  PRODUCING A TORNADO...11 MILES EAST OF NEW RICHMOND...MOVING EAST  
  AT 20 MPH.

* LOCATIONS IMPACTED INCLUDE...
  NEW RICHMOND.
  CYLON.
  DEER PARK.
  
ST. CROIX LAW ENFORCMENT HAS RECEIVED SEVERAL REPORTS OF FUNNEL 
CLOUDS ON THE NORTHEAST SIDE OF NEW RICHMOND SINCE 725 PM.  SPOTTERS 
CONTINUE TO WATCH THIS STORM CLOSELY FOR ADDITIONAL FUNNEL CLOUDS 
AND POSSIBLE TORNADO TOUCHDOWNS.


LAT...LON 4522 9275 4489 9272 4490 9219 4520 9219

$$
MBK

The office that day

Everything else NWS Twin Cities, MN issued on the same UTC day.

IssuedProductOfficeCountiesLasted
Aug 8, 7:06 PM CDTSevere Thunderstorm WarningMPXPolk54 min
Aug 8, 7:29 PM CDTSevere Thunderstorm WarningMPXSaint Croix46 min

Nearby

Tornado Warnings in Wisconsin, 2004Every tornado warning in 2004Tornadoes in 2004

Sources

The product and its follow-ups from the Iowa Environmental Mesonet's archive of National Weather Service and Storm Prediction Center text; the sounding from the Mesonet's radiosonde archive; radar from the NEXRAD Level II archive.